Cut-off-valve gear



(No Model.) 4 Sheets-Sheet 1,

F. SOHUMANN.

GUT-OFF VALVE GEAR.

No. 257,892. Patented May 2,1882,

4 Sheets-Meet 2.

P. SOHUMANN.

GUT-OFF VALVE GEAR.

(No Model.)

A: N N A M U H G S L GUT-OFF VALVE GEAR.

Patented May 2,1882.

Lu; e ntor: JM

N. PETERS, Phnb-Lillmgmphur, Washinglum 04C.

4 Sheets-Sheet 4.

(No Model.)

F. SGHUMAQI N. GUT-OPP VALVE GEAR.

Patented May 2, 1882.

Inventor. W

chest.

, UNITED STATES PATENT OFFICE.

FRANCIS SUHUMANN, OF TRENTON, NEYV JERSEY.

CUT-OFF-VALVE GEAR.

SPECIFICATION forming part of Letters Patent No. 257,392, dated May 2, 1852. Application filed February 27, 1882. (No model.)

To all whom it may concern:

Be it known that I, FRANCIS ScHUMANN, of Trenton, in Mercer county, New Jersey, have invented a. new and useful Improvement in Out-Olf-Valve Gear; and I do hereby declare that the following is a full and accurate description of the same.

As usual, the valves in the ends of the steamchest are duplicates of each other in all. respects, and therefore, for the sake of convenience, only one valve and its gear will be described,'it being understood that the description applies throughout to the duplicate valve and gear in the opposite end of the same stea mchest, the motions being simultaneous but in opposite directions.

My valve is cylindrical and hollow, and is mounted upon a valve-rod, whereby it has imparted to it a longitudinal reciprocation in a corresponding cylindrical case in the, steam The ports are out diagonally in the perimeters of both valve and case and in corresponding directions. The valve is set, however, in such relation to its case that a simple longitudinal reciprocation will not produce coincidence of the ports so as to admit the passage of steam, and I therefore provide means whereby, when the valve is reciprocated, it will also be partly rotated on the valverod as an axis, and the extent of said rotation will determine the amount of opening ofthe port.

Means for automatic regulation of the partial rotation of the valve are various; but the means which I show herein I prefer, and will therefore describe them only.

Within the valve-chest I provide a slide transverse to the line of reciprocation of the valve and gear it with the valve, so that as said slide is reciprocated the valve will be rotated. The reciprocation of the slide is produced simultaneously with the reciprocation of the valve, and therefore a point on the valvesurface will describe a helical-path during the forwardmovement of the valve. It is, however, a prime object of this invention to provide an automatic cut-off, and thisobject is attained by providing an automatic means for liberating the valve from thedevice whereby its rotary motion is imparted, and thereupon rying out said invention, though I do not wish to be limited to the details shown.

Reference is had to the accompanying d raw ings, wherein Figure 1 is a longitudinal sectional perspective of my invention on line 22. Fig. 2 is a horizontal longitudinal section on line a a. Fig. 3 is a transverse section on line mm. Fig. 4 is a transverse section online 3 y. Figs. 5 and 6 are front and side elevations of the cut-ott-gearr Fig. 7 represents the valve in side elevation. Fig. 8 is an end view of the valve, showing range of rotary motion. Fig. 9 is a development of the valve on aplane surface. Y

A is the steam-chest, provided with steaminlet a. in the usual way.

B is the cylindrical valve-case in one end of said steam-chest, and G is a similar cylindrical guide midway between the cases B B, as guides for the disk It, attached to the valves D. The case B is partly suirounrled by a chamber, 1), which constitutes a part .of the steam-passage to the cylinder, and exteriorto said case there is another passage, d, which constitutes the exhaust. When the valve D closes that part'of the case B which is between the passages 12 d,- but when said valv'eiswithdrawn communication between said passages is opened for the escape of the exhaust-steam. The ports cf are cut in the bottom and-,top perimeter of the case B, asshown, upoua'helical line more or less abrupt, but in that particnlar corresponding with the helical move ment of the valve. r

The valve D consists of a cylindricalshell having a central hub, g, and closed at its front end. The hub g extends 7 beyond the inner open end of the valve, and terminates in a disk, h, which is fitted to and slides within the guide 0. The hub g is tubular, and is fitted to revolve upon the valve-rod H, which passes through it. The valve D is provided with two ports, i k, the leading edges whereof coincide with the leading edges of ports cf,- but I prefer to make said ports of ample opening, as shown. A rod, K, is extended between the base of valve D and disk It, and is secured in position near the periphery of said valve and truly parallel with the axis of the valve-rod. The rod K passes through a box, L, which is mounted in a slide, M, capable of motion within the steam-chest transverse to the movement of the valve, and thereby when said valve moves longitudinally it is by the coincident movementoftheslideMcauscd to partly rotate on the valve-rod H as a bearing, with the effect set forth. The slide M is actuated by a rod, N, and receives motion from an eccentric on'the main shaft by means of the eccentricrod N and bell-crank Q.

At a convenient point outside the steamchest the rod N is provided with a slot, a, or some equivalent device, within which a box, P, is fitted to slide, and said box engages with one arm of a bell-crank, Q, the other arm of which is jointed to the eccentric-rod above mentioned. At the lower end of the slot at there is a latch-bolt, R, and a corresponding keeper, 1;, is attached to the box P. A spring, 8, keeps the latch R to its duty. A lever, T, is pivoted at the side of the rod N, and its toe engages the latch R, so that said latch may be withdrawn when the opposite end of said lever is depressed. The depression of the lever T takes place upon contact of its outer end with the surface of an arm, U, which is located in its path. An adjusting-screw, t, serves to limit the insertion of the latch B, so as to secure proper engagement with the keeper T. The outer end of the leverT may be armed with a friction-roller. When the forward movement of the valve commences the rod N is simultaneously lifted by the bell-crank Q, and the valve thereby rotated, until by engagement with the arm U thelatch R is withdrawn, when the'rod immediately falls, and thereby rotates the valve backward and cuts. off the steam. This cut-oft will manifestly take place at one or another part of the stroke, according to the position of the arm U in the path of the lever T. When the rod N falls out of engagement it is arrested in the dash-potV, and it is re-engaged again at the termination of the next downward stroke of the box P. The arm U is p'ivoted to the steam-chest or other permanent part of the machine, and is kept in position by a spring, at. Itis provided with a latera-1: toe, a, which rests against a plate, W, which slides longitudinally in a direction ob lique to the axis of motion of the arm U, so that the surface of said plate against which the toe it rests is more or less advanced as said plateis moved forward or backward in its guide, and as said plate is advanced the toe a and its lever U are advanced also, and the latter is projected farther into the path of the-lever T, so as to produce an earlier cut-oft. Therefore the cut-off is regulated by the position of the plate V, and this I connect by a rod, to, with the governor G, so that thewhole cut-ofi'mechanism will be under the immediate and direct control of the governor, and therefore will be regulated directly by and in accordance with the speed of the engine.

It willv be apparent that the steam-pressure will tend to force the valve D forward against the nut on the end of the valve-rod, and thus offer frictional resistanceto the rotation of the valve. This would be objectionable, and I obviate it and balance the valve by placing a plate or disk, 3 on the valve-rod outside the valve. This plate is fitted to the valve-case the same as the valve, but does not rotate. It affords a solid abutment against which steam may act when admitted between said plate and the valve, and the valve will be thereby balanced, and will encounter but little frictional resistance to its rotation.

Havingdcscribed myinvention, what I claim as new is 1. A cylindrical valve combined with means whereby a simultaneous longitudinal and rotary movement is imparted to it to open and close ports cut diagonally in the perimeters of valve and case.

2. A cylindrical valve and means whereby a simultaneous longitudinal and rotary motion is imparted to it, combined with means whereby said valve is automatically liberated from the device which produces the rotary movement, and thereby permitted to rotate backward and cut off the steam, as described.

3. A cylindrical valve and corresponding cylindrical valve-case, and ports theleadingedges whereof are cut in the perimeters of said valve and case on a helical line, combined with means whereby-a longitudinal reciprocation and a simultaneous rotary movement is imparted to said valve, and means whereby said valve may in a helical line, and a tubular hub, g, and

disk h at the outer end of the same, whereby it is mounted and adapted to rotate upon the valve-rod H, combined with mechanism whereby its rotary motion is determined and controlled.

5. The hollow cylindrical valve D, its tubular hub g, and the disk h at the extremity of the same, and the rod K, extending longitudinally parallel with the axis from the base of the valveto said disk, near the periphery, the whole mounted upon the valve-rod and capable of rotating thereon, combined -with the box L, fitted to move within the steam chest in a line transverse to the direction of reciprocation of the valve D, whereby the rotation of said valve is determined and controlled;

6. The reciprocatingand rotating valve D,

and the reciprocating box L and rod N, whereby it is carried, combined with a sliding box, 1?,

connected with said rod, and a latch whereby said box P and rod N are locked or unlocked, combined with automatic mechanism whereby said latch may be unlocked at a certain point in the stroke, and the valve thereby permitted to revolve backward and cut off the steam, as set forth.

7. The reciprocating and rotating valve D, and the reciprocating box L and rod N, whereby said box .is carried, and the sliding box P and mechanism for actuating the same, com bined with a latch, R, whereby said box 1? is locked to said rod N, and the latch-leverT and adjustable arm U, whereby the latch R may be caused to unlock the box P and liberate the rod N at any desired point in the stroke of said box 1?, substantially as set forth.

8. The reciprocating and rotating valve D, the transversely moving box L and rod N, the sliding box P, and the locking mechanism for the same, combined with the adjustable arm U, the adjusting-plate W, and its oblique guide, whereby the position of said arm is determined and controlled and the point of cutoff determined, as set forth.

9. The reciprocating and rotating valve D, its controlling mechanism L N, the attachable box P, the latch R, and its lever T, combined with the adjustable arm U, adjustingslide W, and the governor, whereby the position of said slide is controlled and regulated in accordance with the speed of the engine.

10. The reciprocating and rotating valve D, mounted upon the valve-rod H as an axis, combined with the non-rotating disk Y, also mounted upon said rod outside saidvalve, whereby said valve is balanced, substantially as set forth.

F. SOHUMANN. Witnesses: WM. E. FINK,

' S. BUTLER MURRAY. 

